Questions tagged [torque]
The torque tag has no usage guidance.
239
questions
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25 views
Which one has a higher output torque PMSM or BLDC motors? Does having a higher rpm mean having high torque? [closed]
Hey I am researching PMSM and BLDC motors for a project where I make a brushless motor and I had a few questions: Which one has a higher output torque PMSM or BLDC motors? and Does being fast mean ...
0
votes
1answer
35 views
How reliable are motor power ratings through time (old motors vs new motors)?
I'm making this question here because I'm a little bit confused with what I've been seeing from some old and new 1/2 hp motors.
I've bought a 1/2 hp induction motor (4-pole, single phase, capacitor ...
0
votes
1answer
43 views
What is the best way to measure and record the power consumption of a servo motor accurately?
I can obtain the rotational angle and velocity of a servo motor. However, I cannot obtain the current nor torque while the motor is turning. What is the best way to measure the power consumption of a ...
0
votes
1answer
37 views
BLDC Motor question
Im looking for a solution, i have a 3kW 320V 3000rpm rated BLDC motor with position hall encoder and a chinese driver. The hall-feedback is working with it.
I would like to use motor between 15 and ...
0
votes
2answers
124 views
Using a motor as a brake
I want to use the motor of an electric vehicle as a brake. It is a 36V ~27A motor.
I looked up 500W+ resistors and they are quite pricey, I figured the cheapest alternative would be 100W resistors in ...
4
votes
1answer
264 views
Old Record Player Motor Doesn't Have Torque To Start
I am restoring a jukebox from 1953 (AMI E-120). Everything is going fine except the main drive motor, an A/C induction motor, cannot start under the load of the platter. It starts fine when the ...
2
votes
2answers
135 views
Do Induction Motors only work if the rotor's coils have a finite resistance?
I just did some calculations, and to me it seems that the induction motor only works when the rotors coils have finite resistance:
I will show that for a single conducting loop, whose current is ...
0
votes
2answers
63 views
Relationship between torque and back-EMF voltage | BLDC motor modeling
I want to simulate an BLDC motor, so I am studying corresponding mathematical model. My problem is that I am little bit confused by the torque equation.
\$e_a\$, \$e_b\$, \$e_c\$ - Back-EMF voltages (...
0
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3answers
113 views
How do i know what resistor value, that's attached to a BLDC motor, i should use in order to get a torque of 100 lb-ft put on my actuator?
Motor P/N is M-3441Y-LN-02D.
Back EMF [Ke] is 38.95 (Vpeak/Krpm).
Continuous torque 2.495 lb-ft.
User manual.
I want to run the actuator coupled with the BLDC motor 60:1 gear ratio in reverse.
So the ...
1
vote
3answers
52 views
How can these two motors produce the same torque if their volt/amp ratings are different and their watts/RPM are the same
My rudimentary understanding of a DC brushed motor is speed is proportional to voltage and torque is proportional current. Therefore a 36 volt 500 watt motor should have a higher RPM rating and a ...
0
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2answers
49 views
Torque and Flux Current
It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my ...
4
votes
2answers
526 views
How to electrically brake a brushless motor
I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors.
I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
0
votes
0answers
17 views
BLDC and Stepper motor torque ration meaning
Ok so after searching on the internet for a pretty long time there are a lot of undefined or roundabout articles about torque for both motors.
Hybrid bipolar stepper motor torque. This one is a little ...
0
votes
2answers
54 views
How Can I Efficiently Adjust Difficulty on a Pedal Generator without Mechanical Gears?
I'm charging a battery using pedal power, like this:
pedals -> brushless generator -> rectifier -> charge controller -> battery
I'd like to be able to ...
1
vote
1answer
42 views
Rotor Current and Torque Producing Current in Induction Motor
Is rotor current of an Induction motor always same with torque producing current?
In torque equation of Induction motor, there is also one factor called rotor power factor. if rotor current and torque ...
0
votes
2answers
62 views
Is the calculation of weight to be suspended inorder to produce electricity from an alternator correct or not?
I bought a alternator with the following specs:
power: 5 hp
rpm: 1800
voltage: 220V
The formula for finding the horsepower is:
horsepower= (RPM X Torque)/5252
By substituting the value of horsepower ...
1
vote
2answers
48 views
Holding torques of a 7W stepper and a 48W stepper
Does anyone know why a 2.5V 2.8A (=7W) stepper has a holding torque of 1Nm whilst a 24V 4A (=48W) stepper has a holding torque of only 2.7Nm:
Stepper 1:
Stepper 2:
The latter draws 7x the power, ...
2
votes
4answers
651 views
Electrical Motors and Frequency
I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly.
It's just a thought experiment, so I'm imagining some theoretical DC ...
0
votes
1answer
26 views
DC series machine
What is the different between electrical and mechanical torque? and How to find the mechanical torque if electrical torque is given?
0
votes
1answer
44 views
Torque issues with DC motor
I am currently trying to use a DC motor with a lead screw to eventually open an close a window. My window requires around 2 kg's of force to open and the distance that needs to be traveled is 20 ...
0
votes
1answer
32 views
how do i calculate stall torque 5.4kg@ 5v 1000mA?
i came to this website https://www.letsbuyrobots.com/en/robot-humanoide-ls-868, and i want to know the servo spec especially the stall torque, and then i found this "2) Torque:5.4kg@5v 1000mA, Power: ...
0
votes
1answer
63 views
Calculations for a DC motor
I want to open and close a window using a DC motor and a lead screw. My window is 20 inches long.
I know buying recommendations are outside the scope of this forum. I have little to no knowledge ...
1
vote
1answer
74 views
Induction motor starting torque and pull out torque
Recently I was doing some work on the induction motor where I found some general theory on starting speed torque curve of the induction motor. Where the theory is the starting torque will be 1.5x of ...
0
votes
1answer
29 views
Sanity check for max motor torque
A KDE brushless DC motor has:
Kt = 0.0189 N*m/A (Kv = 505 rpm/V)
R = 7 mĪ©
voltage range of about 30-60 VDC
Specsheet link
Assume the motor is
connected to 30 VDC input
ideal, sensored, six-step ...
0
votes
0answers
37 views
DC Motors Voltage Equation versus Power Equation
I understand the voltage equation and the power equation for DC motors. But somehow I have a problem understanding moving from one to the other. I am not interested in the IR or IdL/Dt so I will ...
1
vote
1answer
41 views
How to conceptualize electric loading in a motor
I'm struggling to understand the concept of "electric loading" or "current density" in a real motor.
Soong explains how a sheet of conductors in a magnetic field generate force on that sheet which I'...
0
votes
1answer
40 views
How does gearing affect power generated by a permanent magnet DC motor?
I am currently working on a project to harvest electrical energy from a rowing machine. I am trying to make use of gearing ratios to adjust the resistance level offered by the system, and the impact ...
0
votes
0answers
26 views
Problem calculating winding temperature in a brushed DC motor
I'm building a rig for measuring pull out torque for stepper motors, and am looking at dynamic braking and plugging of a permanent magnet DC motor which will be used to apply a variable braking torque....
-1
votes
1answer
49 views
Motor that has at least 50in-lbs of torque and 200RPM [closed]
I need a motor that has at least 50in-lbs of torque and turns 200 times in one minute (200RPM)
THIS screw driver has inside the motor that I need.
I do not want to buy the electric screwdriver I ...
-1
votes
1answer
114 views
Can a stepper motor produce enough torque to open a door?
From a few sources, I read that a stepper motor produces more torque at slow speeds. I want to create an automatic door opener (for a living room). Can a stepper motor produce enough torque for this ...
0
votes
1answer
43 views
The effects on torque/slip when changing speed?
I know that the number of poles altering frequency and voltage changes the speed but I don't know how either alters the torque or slip.
0
votes
2answers
57 views
“Digital Clutch” For Electric Motor
I am in the design phase of a piece of machinery that needs a "Digital Clutch."
Requirements of the project:
Machine must run at several different constant RPM settings.
Machine needs to ability ...
0
votes
0answers
31 views
Confusion with peak and RMS values when calculating the torque of an electric motor
For electric 3-phase motors with a efficiency of 100% (assumed here for simplicity) the following equation holds:
$$P = \omega T = 3 U I$$
where \$U\$ and \$I\$ are the phase RMS values of the ...
0
votes
1answer
29 views
How to determine the right spec of a servo motor given an inertia moment?
I'm working on a trash bin which lid is controlled (opened/closed) by a microcontroller and thus i decided to use a servo motor.
The lid is 47 x 47 x 0.1 cm and because its made from steel has a ...
0
votes
0answers
115 views
Torque calculation in FEMM
I want to calculate the torque of my PMSM in FEMM. I'm a little bit struggling with the signs of the results. First, I draw a line counter-clockwise in the airgap and calculate the torque via the '...
1
vote
0answers
37 views
Stepper motor and driver selection
I would appreciate some advice on selecting a proper stepper motor and driver for my project.
I plan to create an autopilot for my small fishing boat using a Raspberry Pi controlling a stepper motor, ...
0
votes
1answer
56 views
What is the exact formula relating a DC motor's input voltage and torque produced?
I'm trying to control a 12V geared DC motor with encoder through an Arduino by an L298D driver for my self balnace bot.
Based on the angles from the attached gyro sensor and encoder, it calculates ...
0
votes
1answer
38 views
Stall torque for servo
My understanding of stall torque is that it's the amount of torque produced by the servo when the output is stationary. Suppose the stall torque of a servo was 10kg-cm. It can lift the a 10kg load at ...
0
votes
3answers
190 views
BLDC motor current sensing for load torque
I would like to control 14V BLDC motor of battery powered drill. What I want to do remake the drill to nut runner (torque wrench), so I need to sense a motor current which is proportional to motor ...
0
votes
1answer
100 views
Why does rotor of synchoronous generator accelerate during faults?
I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator?
Why does electrical torque decrease during fault in lines that ...
0
votes
2answers
27 views
Driving torque and load torque of a pmdc motor
This question is a follow up to the question I had asked on electric torque of DC motors
I've done my research but couldn't find a satisfactory answer. I would appreciate if the answer was told with ...
1
vote
3answers
130 views
Understanding electric torque of a motor
I'm missing something fundamental in my understanding of the torque of a motor.
Consider the following analogy:
I have a 10kg dumbell on the ground and a 1kg dumbell next to it. Let's say that I ...
1
vote
3answers
119 views
Is there a cheap and accurate electromechanical method to provide a configurable counter-torque?
Given a continuously rotating motor shaft, is there a cheap and accurate electromechanical method that would provide a configurable counter-torque?
Rotation is in one direction only, RPM range is 0 - ...
1
vote
2answers
68 views
Relating input torque on BLDC motor shaft with output current
I am trying to build a drone generator with a gasoline engine and a 14-pole,170KV, 2KW BLDC skateboard motor (this one). Before designing the system and running it, I wanted to clear out a fundamental ...
0
votes
1answer
48 views
Coordination of mechanical and electrical power in electric drives
I want to ask a question to respected specialists in electric drives.
It is known that the mechanical power of an electric motor is determined by a simple formula:
\${P_{mech}}= M {\omega}\$;
...
0
votes
3answers
341 views
Correct way of calculating BLDC torque for a given RPM and Current
A permanent-magnet 3-phase brushless DC electric motor is attached to a load.
Motor is operated with vESC6.6 inverter, which is software-limited to 140A. Measured efficiency at maximum power is 81%.
...
0
votes
1answer
26 views
What affects the current ratings on constant torque pole changing motors?
Two different motors, one is rated 1.49A on slow speed configuration and 1.43A on high speed. The other motor is rated 6.09A on slow speed and 6.99A on high speed.
These are constant torque pole ...
0
votes
1answer
36 views
Running 3 phase asynchronous motor below nominal torque
In class we have a 3 phase asynchronous motor which says 400V delta 690V star. The nominal torque of the motor is 3,7Nm. Can the motor run safely nominal charged on 400V in star configuration?
I'm ...
6
votes
5answers
1k views
Can I measure torque accurately by an electrical or electronic method?
I am a Btech. student from India. We have been given a project in which we have to design a micro-torsion testing device.
We are planning to clamp the specimen and rotate one end by fixed angles ...
2
votes
4answers
2k views
Can a DC brushless motor produce the same torque at different power levels?
I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company:
http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...
